RADISYS 60-0305-03工控DCS系统

产品详细资料
通过将电流注入绕组1的a相和仅注入绕组2的a相，I W1b=I W1c=0 a。因此，如果我们假设注入电流为1×CT，则变换的Y侧电流将为：仅出于差动元件的目的，变换已将电流降低到a相的原始值的0.57倍，并在B相产生表观电流，对于所描述的注射条件。如果现在将1×CT注入绕组1的a相，则应获得所有三相的差动电流的以下值：a相差动：0.57×CT∠0°滞后B相差动：0.5 7×CT≠180°滞后C相：0×CT。用于获得Y侧30°相移的变换会自动从这些信号中去除零序电流。745总是从德尔塔绕组电流中去除零序电流。如果从三角洲侧绕组电流中去除零序分量，则绕组2的电流值将在不平衡条件下发生变化。考虑上述情况，将1×CT注入绕组2的A相。对于1×CT电流，零序值为1.0×CT或0.333×CT A的1/3。因此，I W2a'的值为（1.0–0.333）×CT=0.6667×CT A。如上所述，该值必须除以0.797的CT误差校正因子。因此，当仅在绕组2中注入1×CT时，A相的差动电流值
By injecting a current into Phase A of Winding 1 and Phase A of Winding 2 only, I W1b = I W1c = 0 A. Therefore, if we assume an injected current of 1 × CT, the transformed Y-side currents will be:For the purposes of the differential elements only, the transformation has reduced the current to 0.57 times its original value into Phase A, and created an apparent current into Phase B, for the described injection condition. If a 1 × CT is now injected into Winding 1 Phase A, the following values for the differential currents for all three phases should be obtained: Phase A differential: 0.57 × CT ∠0° Lag Phase B differential: 0.57 × CT ∠180° Lag Phase C: 0 × CT.The transformation used to obtain the 30° phase shift on the Y-side automatically removes the zero-sequence current from those signals. The 745 always removes the zero-sequence current from the delta winding currents. If the zero-sequence component is removed from the Delta-side winding currents, the Winding 2 current values will change under unbalanced conditions. Consider the case described above, with the 1 × CT injected into Phase A of Winding 2. For the 1 × CT current, the zero-sequence value is 1/3 of 1.0 × CT or 0.333 × CT A. The value for I W2a' is therefore (1.0 – 0.333) × CT = 0.6667 × CT A. This value must be divided by the CT error correction factor of 0.797 as described above. Therefore, the value of differential current for Phase A, when injecting 1 × CT in Winding 2 only
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Must be engaged in the installation,assembly or maintenance of equipment and other related industriacontroeectrica machinery and other related technica personne.应用范围:

应用于品牌本系列工业以及生产生活自动化设备产品。

Used in the brand of this series of industriaand production automation eauipment products

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Suitable for scenarios:system integration,non-standard customizationproduction line upgrading and transformation,electrical replacement of original equipment,etc.

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